Acoustics - Measurement of sound insulation in buildings and of building elements - Part 11: Laboratory measurements of the reduction of transmitted impact sound by floor coverings on lightweight reference floors (ISO 140-11:2005)

2010-03-11 EMA: Standard under revision in ISO.

Akustik - Messung der Schalldämmung in Gebäuden und von Bauteilen - Teil 11: Messung der Trittschallminderung durch Deckenauflagen auf leichten Bezugsdecken in Prüfständen (ISO 140-11:2005)

Dieser Teil von ISO 140 legt Verfahren zur Messung der akustischen Eigenschaften von Deckenauflagen hinsichtlich der Trittschallminderung fest. Der Zweck dieses Teils von ISO 140 ist die Festlegung eines Verfahrens zur Bestimmung der Trittschalldämmung einer Deckenauflage unter Norm-Prüfbedingungen. Die Prüfung ist beschränkt auf die Festlegung von Vorgehensweisen zur physikalischen Messung von Schall, der von einer künstlichen Trittschallquelle (Hammerwerk) unter Laborbedingungen erzeugt wird. Aus der Prüfung kann nicht unmittelbar die subjektive Bedeutung der Ergebnisse abgeleitet werden.
In diesem Teil von ISO 140 wird ein Prüfverfahren beschrieben, bei dem das Norm-Hammerwerk zur Nachbildung von Trittschallquellen, wie z. B. Schritten von Menschen in Schuhen, verwendet wird. Außerdem werden in den informativen Anhängen C und E Verfahren aufgeführt, bei denen ein modifiziertes Hammerwerk und eine starke, weiche Trittschallquelle zur Beurteilung der Trittschalldämmung einer Deckenauflage gegenüber Trittschallquellen mit starken Komponenten bei tiefen Frequenzen, wie z. B. Schritte von Menschen oder Springen von Kindern, verwendet werden. Als vereinfachtes Verfahren zur Messung der Trittschallpegelminderung von Decken durch weiche und elastische Deckenauflagen wird im Anhang D das Verfahren mit einem Holzdeckenmodell eingeführt.
Dieser Teil von ISO 140 ist anwendbar für alle ein- oder mehrschichtigen Deckenauflagen auf leichten Decken. Im Fall mehrschichtiger Auflagen können diese fabrikmäßig oder am Prüfort hergestellt sein. Das Prüfverfahren lässt sich nur bei Labormessungen anwenden. Es enthält keine Festlegungen, die Wirksamkeit einer Deckenauflage in situ zu beurteilen.

Acoustique - Mesurage de l'isolement acoustique des immeubles et des éléments de construction - Partie 11: Mesurage en laboratoire de la réduction de la transmission des bruits de choc par les revêtements de sol sur les planchers de référence légers (ISO 140-11:2005)

Akustika – Merjenje zvočne izolirnosti v stavbah in zvočne izolirnosti gradbenih elementov – 11. del: Laboratorijske meritve zmanjšanja prenosa udarnega zvoka s talnimi oblogami na lahkih referenčnih podih (ISO 140-11:2005)

General Information

Status
Withdrawn
Publication Date
14-May-2005
Withdrawal Date
31-Aug-2010
Current Stage
9960 - Withdrawal effective - Withdrawal
Due Date
01-Sep-2010
Completion Date
01-Sep-2010

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SLOVENSKI STANDARD
SIST EN ISO 140-11:2005
01-november-2005
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Acoustics - Measurement of sound insulation in buildings and of building elements - Part

11: Laboratory measurements of the reduction of transmitted impact sound by floor

coverings on lightweight reference floors (ISO 140-11:2005)
Akustik - Messung der Schalldämmung in Gebäuden und von Bauteilen - Teil 11:

Messung der Trittschallminderung durch Deckenauflagen auf leichten Bezugsdecken in

Prüfständen (ISO 140-11:2005)
Acoustique - Mesurage de l'isolement acoustique des immeubles et des éléments de

construction - Partie 11: Mesurage en laboratoire de la réduction de la transmission des

bruits de choc par les revetements de sol sur les planchers de référence légers (ISO 140

-11:2005)
Ta slovenski standard je istoveten z: EN ISO 140-11:2005
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
91.120.20 $NXVWLNDYVWDYEDK=YRþQD Acoustics in building. Sound
L]RODFLMD insulation
SIST EN ISO 140-11:2005 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 140-11:2005
---------------------- Page: 2 ----------------------
SIST EN ISO 140-11:2005
EUROPEAN STANDARD
EN ISO 140-11
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2005
ICS 91.120.20
English version
Acoustics - Measurement of sound insulation in buildings and of
building elements - Part 11: Laboratory measurements of the
reduction of transmitted impact sound by floor coverings on
lightweight reference floors (ISO 140-11:2005)

Acoustique - Mesurage de l'isolement acoustique des Akustik - Messung der Schalldämmung in Gebäuden und

immeubles et des éléments de construction - Partie 11: von Bauteilen - Teil 11: Messung der Trittschallminderung

Mesurage en laboratoire de la réduction de la transmission durch Deckenauflagen auf leichten Bezugsdecken in

des bruits de choc par les revêtements de sol sur les Prüfständen (ISO 140-11:2005)

planchers de référence légers (ISO 140-11:2005)
This European Standard was approved by CEN on 12 May 2005.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the Central Secretariat or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official

versions.

CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,

Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 140-11:2005: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 140-11:2005
EN ISO 140-11:2005 (E)
Foreword

This document (EN ISO 140-11:2005) has been prepared by Technical Committee ISO/TC 43

"Acoustics" in collaboration with Technical Committee CEN/TC 126 "Acoustic properties of

building elements and of buildings", the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of

an identical text or by endorsement, at the latest by November 2005, and conflicting national

standards shall be withdrawn at the latest by November 2005.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of

the following countries are bound to implement this European Standard: Austria, Belgium,

Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,

Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,

Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice

The text of ISO 140-11:2005 has been approved by CEN as EN ISO 140-11:2005 without any

modifications.
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SIST EN ISO 140-11:2005
INTERNATIONAL ISO
STANDARD 140-11
First edition
2005-05-15
Acoustics — Measurement of sound
insulation in buildings and of building
elements —
Part 11:
Laboratory measurements of the
reduction of transmitted impact sound by
floor coverings on lightweight reference
floors
Acoustique — Mesurage de l'isolement acoustique des immeubles et
des éléments de construction —
Partie 11: Mesurage en laboratoire de la réduction de la transmission
des bruits de choc par les revêtements de sol sur les planchers de
référence légers
Reference number
ISO 140-11:2005(E)
ISO 2005
---------------------- Page: 5 ----------------------
SIST EN ISO 140-11:2005
ISO 140-11:2005(E)
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© ISO 2005

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ii © ISO 2005 – All rights reserved
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SIST EN ISO 140-11:2005
ISO 140-11:2005(E)
Contents Page

Foreword............................................................................................................................................................ iv

1 Scope...................................................................................................................................................... 1

2 Normative references ........................................................................................................................... 1

3 Terms and definitions........................................................................................................................... 2

4 Equipment.............................................................................................................................................. 5

5 Test arrangement .................................................................................................................................. 5

5.1 General arrangement............................................................................................................................ 5

5.2 Details of test arrangement.................................................................................................................. 5

5.3 Preparation and installation of test specimen ...................................................................................6

5.4 Influence of temperature and humidity............................................................................................... 7

6 Test procedure and evaluation............................................................................................................ 7

6.1 Generation of sound field..................................................................................................................... 7

6.2 Measurement of impact sound pressure level................................................................................... 7

6.3 Frequency range of measurements .................................................................................................... 8

6.4 Measurement of reverberation time and evaluation of the equivalent sound absorption

area ......................................................................................................................................................... 8

6.5 Correction for background noise ........................................................................................................ 8

6.6 Position of the tapping machine ......................................................................................................... 9

7 Precision .............................................................................................................................................. 10

8 Expression of results.......................................................................................................................... 11

9 Test report............................................................................................................................................ 11

Annex A (normative) Requirements for the tapping machine ..................................................................... 13

Annex B (normative) Types of lightweight reference floors ........................................................................ 15

Annex C (informative) Measurements using a modified tapping machine................................................. 18

Annex D (informative) Measurements using a wooden mock-up floor....................................................... 20

Annex E (informative) Measurements using a heavy/soft impact source .................................................. 22

Annex F (informative) Specification of the heavy/soft impact source ........................................................ 25

Annex G (informative) Example of form for the expression of results ....................................................... 28

Bibliography ..................................................................................................................................................... 30

© ISO 2005 – All rights reserved iii
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SIST EN ISO 140-11:2005
ISO 140-11:2005(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 140-11 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 2, Building

acoustics.

ISO 140 consists of the following parts, under the general title Acoustics — Measurement of sound insulation

in buildings and of building elements:

 Part 1: Requirements for laboratory test facilities with suppressed flanking transmission

 Part 2: Determination, verification and application of precision data

 Part 3: Laboratory measurements of airborne sound insulation of building elements

 Part 4: Field measurements of airborne sound insulation between rooms

 Part 5: Field measurements of airborne sound insulation of façade elements and façades

 Part 6: Laboratory measurements of impact sound insulation of floors
 Part 7: Field measurements of impact sound insulation of floors

 Part 8: Laboratory measurements of the reduction of transmitted impact noise by floor coverings on a

heavyweight standard floor

 Part 9: Laboratory measurements of room-to-room airborne sound insulation of a suspended ceiling with

a plenum above it

 Part 10: Laboratory measurement of airborne sound insulation of small building elements

 Part 11: Laboratory measurements of the reduction of transmitted impact sound by floor coverings on

lightweight reference floors

 Part 12: Laboratory measurement of room-to-room airborne and impact sound insulation of an access

floor
 Part 13: Guidelines
iv © ISO 2005 – All rights reserved
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SIST EN ISO 140-11:2005
ISO 140-11:2005(E)
 Part 14: Guidelines for special situations in the field

 Part 16: Laboratory measurement of the sound reduction index improvement by additional lining

The following parts are under preparation:
 Part 17: Evaluation of the total loss factor

 Part 18: Laboratory measurement of sound generated by rainfall on building elements

© ISO 2005 – All rights reserved v
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SIST EN ISO 140-11:2005
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SIST EN ISO 140-11:2005
INTERNATIONAL STANDARD ISO 140-11:2005(E)
Acoustics — Measurement of sound insulation in buildings and
of building elements —
Part 11:
Laboratory measurements of the reduction of transmitted
impact sound by floor coverings on lightweight reference floors
1 Scope

This part of ISO 140 specifies methods for measuring the acoustic properties of floor coverings from the view-

point of reducing impact sound transmission. The purpose of this part of ISO 140 is to establish a method for

determining the impact sound insulation of a floor covering under standard test conditions. The test is limited

to the specification of procedures for the physical measurement of sound originating from an artificial impact

source (tapping machine) under laboratory conditions and is not directly related to the subjective significance

of the results.

In this part of ISO 140, a test method is described using the standard tapping machine to simulate impact

sources like human footsteps with shoes. In addition, methods using a modified tapping machine and a

heavy/soft impact source are also introduced in informative Annexes C and E for the assessment of impact

sound insulation of a floor covering against impact sources with strong components at low frequencies, such

as human footsteps or children jumping. As a simplified method for the measurement of the reduction of floor

impact sound pressure level by soft and resilient floor coverings, the method using a wooden mock-up floor is

introduced in Annex D.

This part of ISO 140 is applicable to all floor coverings, whether single or multi-layered, as installed on

lightweight floors. In the case of multi-layered coverings, they can be factory-assembled or assembled at the

test site. The test method is applicable only to laboratory measurements. It does not contain any provision that

permits an assessment of the effectiveness of a floor covering in situ.
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

ISO 140-1:1997, Acoustics — Measurement of sound insulation in buildings and of building elements —

Part 1: Requirements for laboratory test facilities with suppressed flanking transmission

ISO 140-2:1991, Acoustics — Measurement of sound insulation in buildings and of building elements —

Part 2: Determination, verification and application of precision data

ISO 140-6:1998, Acoustics — Measurement of sound insulation in buildings and of building elements —

Part 6: Laboratory measurements of impact sound insulation of floors

ISO 140-8:1997, Acoustics — Measurement of sound insulation in buildings and of building elements —

Part 8: Laboratory measurements of the reduction of transmitted impact noise by floor coverings on a

heavyweight standard floor

ISO 354:2003, Acoustics — Measurement of sound absorption in a reverberation room

© ISO 2005 – All rights reserved 1
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SIST EN ISO 140-11:2005
ISO 140-11:2005(E)

ISO 9052-1:1989, Acoustics — Determination of dynamic stiffness — Part 1: Materials used under floating

floors in dwellings

ISO 9053:1991, Acoustics — Materials for acoustical applications — Determination of airflow resistance

IEC 61672-1:2002, Electroacoustics — Sound level meters — Part 1: Specifications
IEC 60942:2003, Electroacoustics — Sound calibrators

IEC 61260:1995, Electroacoustics — Octave-band and fractional-octave-band filters

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
average sound pressure level in a room

ten times the common logarithm of the ratio of the space and time average of the sound pressure squared to

the square of the reference sound pressure, the space average being taken over the entire room with the

exception of those parts where the direct radiation of a sound source or the near field of the boundaries (wall,

etc.) is of significant influence
NOTE 1 If a continuously moving microphone is used, L is determined by
pt() dt
L = 10 lg dB (1)
where
p(t) is the sound pressure, in pascals;
p is the reference sound pressure and is equal to 20 µPa;
T is the integration time, in seconds.
NOTE 2 If fixed microphone positions are used, L is determined by
j=1
L = 10 lg dB (2)
np⋅
where p is the r.m.s. sound pressure at n different positions in the room.

NOTE 3 In practice, the sound pressure levels L are usually measured. In this case L is determined by

n
L /10
L = 10 lg 10 dB (3)
n
j=1
where L is the sound pressure level L to L at n different positions in the room.
j 1 n
NOTE 4 Sound pressure level is expressed in decibels.
2 © ISO 2005 – All rights reserved
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SIST EN ISO 140-11:2005
ISO 140-11:2005(E)
3.2
impact sound pressure level

average sound pressure level in a one-third-octave band in the receiving room when the floor under test is

excited by the standardized impact source
NOTE It is expressed in decibels.
3.3
normalized impact sound pressure level

impact sound pressure level L increased by a correction term given in decibels, being ten times the common

logarithm of the ratio between the measured equivalent absorption area A of the receiving room and the

reference equivalent absorption area A
LL=+10 lg dB (4)
with A = 10 m
NOTE It is expressed in decibels.
3.4
reduction of normalized impact sound pressure level
improvement of normalized impact sound insulation

for a given one-third-octave band, the reduction in normalized impact sound pressure level resulting from

installation of the test floor covering on a lightweight reference floor
∆=L LL− dB (5)
t n,t,0 n,t
where

L is the normalized impact sound pressure level of the lightweight reference floor without the floor

n,t,0
covering;

L is the normalized impact sound pressure level of the lightweight reference floor with the floor

n,t
covering.

NOTE 1 If the receiving room absorption is unchanged during the test, it is assumed that the reduction in impact sound

pressure level is equivalent to the reduction in normalized impact sound pressure level.

NOTE 2 The subscript “t” refers to timber floors as the type of base floor.

NOTE 3 In this part of ISO 140, three types of lightweight reference floors are specified in Annex B. When it is

necessary to specify the reference floor used in the measurement, ∆L , ∆L and ∆L may be used for the reference

t,1 t,2 t,3
floors No. 1, No. 2 and No. 3, respectively.

NOTE 4 The reduction of normalized impact sound pressure level is expressed in decibels.

3.5
top floor

lightweight floor construction, mounted on top of the sub-floor, on which the floor covering under test is

mounted
3.6
sub-floor
standard heavyweight test floor as specified in ISO 140-8
© ISO 2005 – All rights reserved 3
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SIST EN ISO 140-11:2005
ISO 140-11:2005(E)
3.7
test floor

combined floor consisting of the top floor mounted on the sub-floor and the sub-floor

3.8
maximum sound pressure level
Fmax

maximum sound pressure level of an impact sound measured by the dynamic characteristic of F of the sound

level meter
NOTE It is expressed in decibels.
3.9
impact sound pressure level
i,Fmax

average of the maximum sound pressure levels measured in the receiving room when the floor under test is

excited by the heavy/soft impact source specified in Annex F
NOTE It is expressed in decibels.
3.10
reduction of impact sound pressure level
improvement of impact sound insulation

for a given one-third-octave or octave band, the reduction in the impact sound pressure level resulting from

the installation of the test floor covering on a lightweight reference floor
∆=LL −L (6)
r i,Fmax,0 i,Fmax
where

L is the impact sound pressure level of the lightweight reference floor without floor covering;

i,Fmax,0

L is the impact sound pressure level of the lightweight reference floor with floor covering under

i,Fmax
test.
NOTE It is expressed in decibels.
3.11
impact force
F(t)

instantaneous force acting on the floor under test when the heavy/soft impact source is dropped on the floor

NOTE It is expressed in newtons.
3.12
impact force exposure level

ten times the common logarithm of the ratio of the time-integrated value of the impact force squared to the

square of the reference force
1(Ft)
L = 10 lg dt dB (7)
0 F
1
where
F(t) is the impact force, in newtons;
F is the reference force (= 1 N);
4 © ISO 2005 – All rights reserved
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SIST EN ISO 140-11:2005
ISO 140-11:2005(E)
t – t is the time duration of the impact force, in seconds;
2 1
s is the reference time interval (= 1 s).
NOTE The impact force exposure level is expressed in decibels.
4 Equipment
The equipment shall comply with the requirements of Clause 6.
The tapping machine shall meet the requirements given in Annex A.

The accuracy of the sound level measurement equipment shall comply with the requirements of accuracy

Class 1 defined in IEC 61672-1:2002. The complete measuring system including the microphone shall be

adjusted before each measurement using a sound calibrator that complies with the requirements of accuracy

Class 1 defined in IEC 60942:2003. For sound level meters calibrated for measurements in sound fields of

progressive plane waves, corrections for the diffuse sound field shall be applied.

The filters shall comply with the requirements given in IEC 61260.

The reverberation time measurement equipment shall comply with the requirements given in ISO 354.

NOTE 1 For pattern evaluation (type testing) and regular verification tests, recommended procedures for sound level

[3] [4]
meters are given in OIML R58 and OIML R88 .

NOTE 2 A method using a modified tapping machine and that using a standard heavy/soft impact source are also

introduced in Annex C (informative) and Annex E (informative), respectively, for the assessment of impact sound insulation

of a floor covering against real impact sources such as human walking and stepping.

5 Test arrangement
5.1 General arrangement

Two vertically adjacent rooms shall be used, the upper one being designated the “source room” and the lower

one the “receiving room”. They shall be separated by a lightweight reference floor on which the floor covering

under test is installed.

The airborne sound from the tapping machine that is transmitted to the receiving room shall be such that the

level will be at least 10 dB below the level of transmitted impact sound in each frequency band.

5.2 Details of test arrangement
5.2.1 Source room
There are no specific requirements for the size and shape of the source room.
5.2.2 Receiving room
The receiving room shall comply with the requirements of ISO 140-1.
5.2.3 Lightweight reference floor

The reference floor on which the test covering is to be installed shall be chosen from the reference floors

described in Annex B.

The surface area, viewed from the receiving room, shall be at least 10 m . On the source side, the permissible

test area for installation of floor coverings of category I (see 5.3.1.2) will be the region at least 0,5 m from the

edges of the reference floor.
© ISO 2005 – All rights reserved 5
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SIST EN ISO 140-11:2005
ISO 140-11:2005(E)
5.2.4 Condition of reference floor surface

It shall be ensured that the surface of the reference floor is flat to within ± 2 mm in a horizontal distance of

200 mm, and sufficiently hard to endure the impacts of the tapping machine.
5.3 Preparation and installation of test specimen
5.3.1 Classification
5.3.1.1 General

Depending upon the type of floor covering, the test specimens should be either slightly larger than the tapping

machine including supports or equal to the floor area (see 6.6).
5.3.1.2 Category I (small specimens)

This category includes flexible coverings (plastics, rubber, cork, matting, or combinations thereof) that may be

installed loosely or by adhesion to the floor surface. The method of installation shall be clearly described in the

test report.
5.3.1.3 Category II (large specimens)

This category includes rigid homogeneous surface materials or complex floor coverings of which at least one

constituent is rigid. The assembled floor covering may be tested under load. Normal furnishing should be

2 2

simulated with a uniformly distributed load of 20 kg/m to 25 kg/m . The distributed load should be arranged

with at least one weight-piece per square metre of the flooring area.
5.3.1.4 Category III (stretched materials)

This category includes flexible coverings that cover the floor from wall to wall. Large specimens should be

tested, but loading is not required.
5.3.1.5 Materials of uncertain classification

In the case of uncertainty as to the appropriate category for a material, the testing laboratory should decide

whether small or large specimens will be tested.
5.3.2 Installation

Follow strictly the manufacturer's installation instructions, paying special attention to the edges of the

specimen.

Install coverings to be mounted with adhesive with great care, normally with the adhesive covering the entire

surface. If the adhesive is applied in isolated patches, describe the exact procedure. Follow strictly the

manufacturer’s instructions for use of the adhesive, especially with regard to the amount and the bonding-time.

Report the type of adhesive and the bonding-time.
5.3.3 Size and number of specimens
5.3.3.1 Category I

Install three samples, preferably of different production runs but from the same source. Each sample shall be

large enough to support the tapping machine.
6 © ISO 2005 – All rights reserved
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SIST EN ISO 140-11:2005
ISO 140-11:2005(E)
5.3.3.2 Categories II and III
The specimen shall cover the whole surface of the reference floor.
5.4 Influence of temperature and humidity

Usually, and always in the case of a surface whose acoustic properties are likely to depend on either

temperature or humidity, measure and report the temperature at the centre of the upper floor surface and the

humidity of the air in the source room. The floor temperature thus observed should preferably be in the range

18 °C to 25 °C.
6 Test procedure and evaluation
6.1 Generation of sound field
The impact sound shall be generated by the tapping machine (see Clause 4).

With the exception of testing category I specimens, the tapping machine shall be placed in at least six different

positions not symmetrically distributed on the floor under test. The
...

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